JPS5849806A - Combustion apparatus for liquid fuel - Google Patents

Abstract

PURPOSE:To increase the variation range of vaporizing rate of combustion gas, by providing a damper mechanism to control the rate of air, flowing into a combustion chamber from small holes perforated through the wall of a combustion chamber, to the inside of a wick guide cylinder, in a liquid fuel combustor of double cylinder type, of which vaporizing source is a wick. CONSTITUTION:A damper mechanism to control the rate of air is provided to the inside of a wick guide cylinder 3, of which area is smaller than the total section area of small holes provided to a wick outer casing 4, facing to the vaporizing surface of a wick 2. The wick guide cylinder 3 is a passage of the air which is fed into a combustion chamber B from small holes perforated through the wall of an inner cylinder 5. The rate of air, passing through the damper mechanism, is changed by moving a lever 14 to the right and the left sides. Heat-resistant, coating compound is put on the vaporizing surface outside of a wick 2, to limit the effective vaporizing area. The distance between the wick 2 and the upper part of the wick outer casing 4 is formed narrower than that between the wick 2 and the inner cylinder 5. With such an arrangement, the variation range of vaporizing rate of combustion gas can be increased in a liquid fuel combustor.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dual-tube type liquid fuel combustion device using a lamp wick as a vaporization source, and to widen the variable range of combustion amount. They are used as home heaters and regulators, and have many advantages such as requiring no power supply, being small and lightweight, easy to move, less likely to break down, and being inexpensive, making them the mainstream heater. . However, with traditional kerosene stoves that use a wick as the vaporization source, the range of variable combustion rate is narrow (in order to obtain the best combustion conditions, it is almost impossible to vary the rate of combustion). Depending on the conditions, the temperature in the room could rise too high, so it was necessary to adjust the heating temperature by repeatedly turning on and off the fire.

At this time, an odor is generated when igniting and extinguishing, so in reality, many places use the appliance continuously without igniting and extinguishing it, resulting in excessive heating.

In addition, in order to widen the variable range of combustion amount, conventional 3.
- Some methods have been put into practical use, such as changing the exposed height of the lamp wick and varying the number of small holes near the wick in the inner and outer flame tubes. When the temperature is lowered, the temperature near the wick rises, causing thermal decomposition of the fuel and the formation of tar near the vaporized part of the wick, resulting in a decrease in calorific value, poor fire performance, and depending on the quality of the fuel, the wick may In some cases, tar accumulated on the walls, making it difficult to move up and down.

In addition, in the latter method, the pores are mechanically opened and closed in the high-temperature parts of the lower part of the outer flame tube and inner flame tube, which makes the structure complicated, and the accuracy of opening and closing deteriorates due to thermal deformation, etc., resulting in combustion failure. There was a drawback that it became uniform. Further, the variable range of combustion amount was about 300 to 400 hours.

The present invention expands the variable range of combustion amount with a simple configuration.

Hereinafter, an embodiment in which the present invention is applied to a portable kerosene stove will be explained with reference to the accompanying drawings.

Reference numeral 1 denotes a fuel tank, which is omitted in Figure 1, and has a configuration in which fuel is supplied from the tank to a substantially constant liquid level. 2
The lamp wick is made of a porous material such as a fiber braided body, and its lower end is immersed in the fuel 10 in the fuel tank 1, and the fuel is sucked up to the upper end by capillary action. The upper end looks into the combustion chamber B and has a conversion part where oil-containing fuel is heated and vaporized.

4 is a core outer cylinder having a small hole in its upper part. 6 is an inner flame tube having a large number of small holes; 6 is an outer flame tube having a large number of small holes; 7 is a lath connected to the outer flame tube 6;
A red-hot cylinder made of a wire mesh or the like, 8 an outer cylinder, and 9 a cylinder made of a heat-resistant and transparent material such as glass, are arranged continuously on the outer cylinder 8. Inner flame tube 6° Outer flame tube 6. Although the outer cylinder 8 is not shown in the figure, it is fixed in a circular shape with a cross pin, and the outer flame cylinder 6.
A combustion chamber B is formed by the gap between the red-hot tube 7 and the inner flame tube 6.

The first feature of this embodiment is that the holes are smaller than the total cross-sectional area of the small holes provided in the outer wick tube 4 (outer wall of the combustion chamber) corresponding to the vaporization surface of the lamp wick 2 exposed in the combustion chamber B. ?The mechanism is core guide tube 3
A fixing plate 11 that is fixed to and has an opening 11' as shown in FIG.
, a movable plate 12 having an opening 12', and a rotating shaft 13 fixed to the movable plate 12 and connected to a lever 14. By operating the lever 14 left and right, the movable plate 12 rotates, and the fixed plate 11 By changing the area of the opening 11' depending on the closed portion of the movable plate 12, the amount of air passing through can be varied.

A second feature of this embodiment is that the outer surface of the vaporizing surface of the lamp wick 2 is coated with a heat-resistant paint or the like to suppress the effective vaporizing area.

Furthermore, the third feature of this embodiment is that the gap between the lamp wick 2 and the upper part of the outer wick cylinder 4 is made narrower than the gap between the lamp wick 2 and the inner flame cylinder 6.

In the above configuration, when the tip of the lamp wick 2 impregnated with fuel is ignited by a igniter (not shown), the heat and the inner flame tube 6. The fuel is vaporized by the air flow supplied from the small hole in the outer core tube 4, and then the inner flame tube 6, the outer flame tube 6. Even if the igniter is removed, vaporization continues and combustion occurs due to feedback to the air supplied from the small holes of the incandescent cylinder 7. - At this time, the amount of fuel vaporized is controlled by the partial pressure of the fuel vaporized gas near the surface of the wick 2 and the surface area of the vaporization surface, so if the exposed area of the wick 2 is kept constant, the amount of air to the turning section can be increased or decreased. The partial pressure changes and the amount of vaporization can be adjusted.

In this embodiment, the combustion amount is made variable by increasing or decreasing the amount of air supplied to the vicinity of the surface of the lamp wick 2, and this is effectively done in the inner air passage where the air amount can be easily adjusted.

In the conventional configuration, the amount of vaporized from the lamp wick 2 is the same on the inner and outer surfaces of the wick 2 vaporizing surface, or the amount of vaporized on the outer surface is greater, so when changing the combustion amount, the amount of air supplied is It is necessary to adjust both the air (air supplied from the small holes in the inner flame tube 6) and the outside air (air supplied from the small holes in the core outer tube 4 and outer flame tube 6), or to adjust the outside air. However, since the outer air passage is complicated, there is no appropriate adjustment method, and the method of directly opening and closing the small holes in the outer flame tube 6 and the core outer tube 4 has been proposed.
, -1, resulting in a complex configuration. In addition, if only the outside air is adjusted, the amount of vaporization on the inner surface of the wick 2 is difficult to change, so the variable range of the amount of combustion relative to the amount of air is narrow, and the ratio of air to vaporization changes, resulting in poor combustion conditions. ◎ In contrast, in this example, the amount of air supplied to the outer surface of the lamp wick 2 was reduced, the effective vaporization area of the outer surface of the lamp wick 2 was reduced, and the outer surface of the lamp 2 was reduced. The amount of vaporization from the outside surface of the wick 2 is suppressed by methods such as moving the air flow supplied from the small hole away from the outside surface of the wick 2, and the amount of vaporization from the outside surface of the wick 2 is suppressed.
By increasing the ratio of the amount of vaporization from the inner surface, the rate of change in the total amount of vaporization due to the inside air is increased, and the variable range of the amount of vaporization is widened. In addition, the inside air can be adjusted by -
Because it is carried out on the upstream side, the vaporization air at the bottom of the inner flame tube 6 and the combustion air at the middle and upper portions can be adjusted simultaneously, and the change in the amount of vaporization (combustion amount) with respect to the change in air amount approaches a proportional relationship, so that the air and fuel can be adjusted at the same time. The variation range of the combustion amount becomes wider when the ratio is set to 0, but the vaporized fuel gas condenses on the inner surface of the outer core cylinder 4.As described above, the present invention has a simple configuration, and

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is a plan view of the fixed plate, and Fig. 3 is a plan view of the movable plate.
・・Core outer cylinder, 6・・・・・・Inner flame cylinder, e ・・・・・・Outer flame cylinder, 11・・・−・ Moving plate・ Name of agent Patent attorney Toshio Nakao 1 other person N1
81 2111 Figure 3

Claims (1)

[Scope of Claims] (1) A combustion chamber formed by a gap between an inner flame cylinder having a large number of small holes and an outer flame cylinder having a large number of small holes; It has a lamp wick that sucks up the fuel from the tank by capillary action, and the total cross-sectional area of the multiple small holes provided in the outer wall of the combustion chamber corresponds to the outside of the vaporization surface at the tip of the wick, and corresponds to the inside of the vaporization surface at the tip of the wick. be smaller than the total cross-sectional area of the multiple small holes provided in the combustion chamber wall, and
A liquid fuel combustion device equipped with a damper mechanism that adjusts the amount of air flowing into the combustion chamber through small holes in the combustion chamber wall. (Rin) The liquid fuel combustion device according to claim 1, in which the outside of the vaporization surface at the tip of the wick is coated with a heat-resistant paint. (3) Between the outside of the vaporization surface at the tip of the wick and the outer wall of the combustion chamber - I
! 2. The liquid fuel combustion device according to claim 1, wherein i is narrower than the gap between the inside of the vaporization surface at the tip of the wick and the inner wall of the combustion chamber. C